Tribological Properties of Porous Polyimide Retainer Materials

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: closed (31 October 2024) | Viewed by 1061

Special Issue Editor


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Guest Editor
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: wear; lubrication; multiscale simulation

Special Issue Information

Dear Colleagues,

Bearing lubrication failure is one of the main reasons for the failure of space-moving mechanisms. Oil-impregnated porous polyimide retainer materials are usually used to solve friction and lubrication problems in the aerospace field. Porous polyimide retainer materials with a micropore structure can be used as lubricant storage and as a migration channel to provide lubricant circulation supply in bearing systems. The tribological properties of porous retainer materials significantly affects the bearing lubrication performance and service life. However, a lack of understanding of tribological mechanisms hinders the optimization design of porous polyimide retainer materials and their applications in other fields.

This Special Issue on the “Tribological Properties of Porous Polyimide Retainer Materials” hopes to attract both academic and industrial researchers to promote innovation in the application of porous polyimide retainer materials, thereby fostering new ideas for future research and expanding knowledge in this field. We sincerely hope that you will accept our invitation to contribute to this Special Issue.

The potential topics include, but are not limited to, the following:

  • Friction and wear properties of porous polyimide retainer materials;
  •  Lubrication mechanisms of porous polyimide retainer materials;
  • Lubricant migration mechanisms of porous polyimide retainer materials;
  • Tribological properties of oil-impregnated porous materials.

Dr. Pengzhe Zhu
Guest Editor

Manuscript Submission Information

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Keywords

  • tribology
  • porous
  • friction
  • wear
  • lubrication
  • porous material
  • wear rate
  • bearing

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Published Papers (1 paper)

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Research

15 pages, 5583 KiB  
Article
Molecular Dynamics Simulations of Lubricant Supply in Porous Polyimide Bearing Retainers
by Wenbin Chen, Chong Wang, Gang Zhou, Fengbin Liu, Wenzhong Wang and Pengzhe Zhu
Lubricants 2024, 12(10), 343; https://doi.org/10.3390/lubricants12100343 - 5 Oct 2024
Viewed by 750
Abstract
Space bearing retainers are widely made of a porous, oil-impregnated material due to the unmaintainability of spacecraft. Porous polyimide (PI) material with a certain micropore structure can be used as a lubricant storage and migration channel to realize the lubricant circulation supply in [...] Read more.
Space bearing retainers are widely made of a porous, oil-impregnated material due to the unmaintainability of spacecraft. Porous polyimide (PI) material with a certain micropore structure can be used as a lubricant storage and migration channel to realize the lubricant circulation supply in the bearing system. In this work, molecular dynamics simulations are adopted to model the lubricant outflow process from the pore of the PI material. Coarse-grained models are constructed to investigate the lubricant migration behaviors with different rotation speeds, rotation radii, and pore sizes. The results show that a lubricant within the pore fails to outflow due to the capillary effect in a static state. However, for the rotating pores, if the centrifugal forces resulting from rotation exceed the capillary forces, the lubricants will begin to flow out. Furthermore, the lubricant in the large pore is easier to outflow due to the smaller capillary force, which is the main mechanism of lubricant outflow from the pores. Full article
(This article belongs to the Special Issue Tribological Properties of Porous Polyimide Retainer Materials)
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